Method of making pinions.



Nu. 64!,105. Patented Jan. 9, I900.

a. E. HART.

METHOD OF MAKING PINIONS.

(Application filed Dec. 8, 1896.)

(No Model.)

GEORGE EDWIN HART, OF \VATERBURY, CONNECTICUT, ASSIGNOR TO THE \VATERBURY WATCH COMPANY, OF SAME PLACE.

METHOD OF MAKING PINIONS.

fiPECIFICATION forming part Of Letters Patent N0. 641,105, dated January 9, 1900.

Application filed December 8, 1896. $erial No. 614,945. (No model.)

To an whom it may concern.-

Be it known that I, GEORGE EDWIN HART,of Waterbury, in the county of New Haven, and in the State of Connecticut, have invented certain new and useful Improvements in Methods of Making Pinions; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, in which- Figure 1 is a perspective view of the blank as first produced; Fig.2,a likeview of the same after having been subjected to the action of the dies for forming a portion of one set of teeth; Fig. 3, a perspective View of the pinion with all of its teeth completed. Figs. 4 and 5 are respectively perspective views of the dies used to produce the results illustrated in Figs. 2 and 3.

Letters of like name and kind refer to like parts in each of the figures. v

The object of my invention is to enable pinions with sets or series of teeth of difierent width of face to be accurately and cheaply made without lathework or the use of cut hereinafter specified.

In certain mechanisms, notably registering or counting machines, where one index-wheel is moved from and with less frequency than an adjacent Wheel, a pinion is employed having two series of teeth of different width of face, one set of which teeth meshes with both wheels and the other set with but one wheel. Practically the formation may be described as one where alternate teeth are elongated.

It is to the manufacture of such a pinion as this that my invention relates.

In the practice of my method I first produce by a suitable punch and die a blank consisting, as shown in Fig. 1, of a disk A having a thickness corresponding with the width of the wider teeth of the two sets. Said blank I subject to the action of dies B and C, (shown in Fig. 4,) the former of which has a cavity b with a circular central portion and three equidistant radial portions, while the other die 0 has a flat or plain Workingface. The result of the operation of these dies is shown in Fig. 2, the blank being made to take the conformation of the cavity 19 for a portion of its thickness, (the amount the teeth of one set are to be wider than those of the other,) being flattened out in an irregular outline or fin-like portion adjacent to the part that is conformed to said cavity. The product of said dies B and C is next acted upon by the dies D and E, (shown in Fig. 5,)

the former being the female with its opening 6e d cut in correspondence with the completed pinion, and the latter the male die, and per fectly complementary to the other. By the operation of said dies D and E thethree teeth partially formed by the dies B and C are fin- 6 5 ished and three others alternating therewith are formed, the surplus of the fin-like portion being removed to produce this result. The pinion is now complete, except as to providing the hole for the reception of its arbor, which may be done in any suitable way.

The pinionas made by me is free from burs and is much cheaper in production than where lathework or other modes of making in which cutting-tools are required are employed.

Of course it is to be understood that I do not limit myself to the making of pinionshaving any particular number of teeth.

Having thus described my invention, what I claim is-- 1. The method of makingpinions with teeth that are relatively wide and narrow, which consist, in forming on one side of a suitable blank a portion of each of the wide teeth, by subjecting the blank to pressure,whereby said portions of teeth stand in relief on the blank, and then removing the parts of the blank necessary to complete the said partial teeth and form the narrow teeth, substantially as 0 specified.

2. The method of making pinions with teeth that are relatively wide and narrow, which consists in subjecting a blank to pressure so as to compress a portion of it, leaving parts 5 that constitute portions of the body of the pinion and portions of the wide teeth in rehave hereunto set my hand this 24th day of lief, and then removing all of the compressed November, A. D. 1896.

portion of the blank save parts intermediate the teeth portions in relief, to complete the GEORGE EDWIN HART 5 Wide teeth and producethe narrow teeth, sub- Witnesses:

stantially as and for the purpose described. CHARLES S. CHAPMAN,

In testimony that I claim the foregoing I S. L. ARTHUR. 

